package com.itheima.common;

import lombok.extern.slf4j.Slf4j;
import org.apache.catalina.connector.CoyoteOutputStream;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * ClassName: CommonController
 * Package: com.itheima.common
 * Description:
 *
 * @Author: @Albert
 * @Version: 1.0
 */
@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传方法
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID生成新文件名,防止文件名重复或者被覆盖
        String fileName = UUID.randomUUID().toString()+suffix;
        File dir = new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入里读取文件内容
            FileInputStream fis = new FileInputStream(new File(basePath+name));
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            //输出流,将文件写回浏览器,在浏览器展示图片
            int len = 0;
            byte[] bytes = new byte[1024];
            while((len = fis.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
